package com.xj.demo.classcommand;

public class StackOperateTest {
    private long num = 10;
    public void dupAndPop(){
        Object obj = new Object();
        obj.toString();
    }

    public void pop2(){
        foo();
    }

    public long foo(){
        return 0;
    }
    public long dup2_x1(){
        return num++;
    }
}
